Hello rsc (cc: golang-dev@googlegroups.com), I'd like you to review this change.
LGTM
*** Submitted as http://code.google.com/p/go/source/detail?r=11b3ee92bb43 *** add _testmain.go to .hgignore R=rsc, r2 CC=golang-dev http://codereview.appspot.com/2332042